NTSB Identification: ATL97LA009.
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Accident occurred Friday, October 25, 1996 in AMELIA ISLAND, FL
Probable Cause Approval Date: 08/21/1997
Aircraft: Mooney M20K, registration: N32DG
Injuries: 2 Serious,1 Minor,1 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
During the climb after takeoff, the engine began to run rough, then lost power. According to the pilot, he turned on the boost pump, and the engine quit. The pump was turned off, the engine surged, then quit again. During a forced landing, the airplane struck trees, then came to rest on a street. Postaccident examination of the engine revealed corrosion in the left magneto, which was indicative of moisture contamination of the magneto that may have resulted in a loss of power. Additionally, the engine driven fuel pump pressure was set high, which would have resulted in a rich mixture, when the boost pump was activated. The engine had been equipped with pressure type, Slick Electro Model 6224 magnetos. A service bulletin, applicable to another aircraft manufacturer, had been issued by the magneto manufacturer to inspect the pressurized magnetos each 100 hours for evidence of moisture contamination. The same information was contained in the magneto maintenance and overhaul manual. The airplane was maintained under an annual inspection program, with no intervening 100 hour inspections; 159 hours of flight time had been accumulated since the last annual inspection.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: inadequate maintenance/inspection, which resulted in a failure to detect and correct moisture contamination of the left magneto; and/or improper adjustment of the engine fuel pump output, which resulted in excessive fuel pressure. Full narrative available
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